A mechanism for tunable autoinhibition in the structure of a human Ca2+/calmodulin- dependent kinase II holoenzyme.

A mechanism for tunable autoinhibition in the structure of a human Ca2+/calmodulin- dependent kinase II holoenzyme.
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DOI:
10.1016/j.cell.2011.07.038
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发表时间:
2011-09-02
期刊:
影响因子:
64.5
通讯作者:
Kuriyan J
Kuriyan J
中科院分区:
生物学1区
文献类型:
--
作者:
Chao LH;Stratton MM;Lee IH;Rosenberg OS;Levitz J;Mandell DJ;Kortemme T;Groves JT;Schulman H;Kuriyan J

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钙/钙调蛋白依赖性激酶II(CaMKII)形成高度保守的十二聚体组装,其对钙脉冲序列的频率敏感。无论是十二聚体组装的结构,也不知道它如何调节CaMKII。我们提出了一种自抑制全长人CaMKII全酶的晶体结构,揭示了一个意想不到的紧凑安排的激酶结构域对接对中央枢纽,与钙调蛋白结合位点完全无法访问。我们表明,这种紧凑的对接是重要的激酶结构域的自抑制和设置全酶的钙响应。CaMKII亚型的比较,不同的激酶结构域和枢纽之间的连接器的长度,表明这些相互作用可以加强或削弱连接器长度的变化。这种自抑制状态之间的平衡提供了一种简单的机制,用于调节钙反应,而不改变枢纽或激酶结构域。
Calcium/calmodulin-dependent kinase II (CaMKII) forms a highly conserved dodecameric assembly that is sensitive to the frequency of calcium pulse trains. Neither the structure of the dodecameric assembly nor how it regulates CaMKII are known. We present the crystal structure of an autoinhibited full-length human CaMKII holoenzyme, revealing an unexpected compact arrangement of kinase domains docked against a central hub, with the calmodulin binding sites completely inaccessible. We show that this compact docking is important for the autoinhibition of the kinase domains and for setting the calcium response of the holoenzyme. Comparison of CaMKII isoforms, which differ in the length of the linker between the kinase domain and the hub, demonstrates that these interactions can be strengthened or weakened by changes in linker length. This equilibrium between autoinhibited states provides a simple mechanism for tuning the calcium response without changes in either the hub or the kinase domains.
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